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net/cdc_ncm: Fix multicast RX support for CDC NCM devices with ZLP 

ZLP for DisplayLink ethernet devices was enabled in 6.0:
266c0190ae ("net/cdc_ncm: Enable ZLP for DisplayLink ethernet devices").
The related driver_info should be the "same as cdc_ncm_info, but with
FLAG_SEND_ZLP". However, set_rx_mode that enables handling multicast
traffic was missing in the new cdc_ncm_zlp_info.

usbnet_cdc_update_filter rx mode was introduced in linux 5.9 with:
e10dcb1b6b ("net: cdc_ncm: hook into set_rx_mode to admit multicast
traffic")

Without this hook, multicast, and then IPv6 SLAAC, is broken.

Fixes: 266c0190ae ("net/cdc_ncm: Enable ZLP for DisplayLink ethernet devices")
Signed-off-by: Santiago Ruano Rincón <santiago.ruano-rincon@imt-atlantique.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Santiago Ruano Rincón 2022-11-21 21:53:05 +01:00 committed by David S. Miller
parent a487069e11
commit 748064b54c
1 changed files with 1 additions and 0 deletions
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drivers/net/usb/cdc_ncm.c
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@ -1915,6 +1915,7 @@ static const struct driver_info cdc_ncm_zlp_info = {
.status = cdc_ncm_status,
.rx_fixup = cdc_ncm_rx_fixup,
.tx_fixup = cdc_ncm_tx_fixup,
.set_rx_mode = usbnet_cdc_update_filter,
};
/* Same as cdc_ncm_info, but with FLAG_WWAN */